Changes with Aloha.Editor 1.4.28

Bugfix SUP-4001

In Firefox clicking into a table cell sometimes threw an error because a property on the non-standard window.event
object was accessed. This has been fixed. The Aloha-Editor table plugin will now always use the event object passed to
the event handler by the browser.

Bugfix SUP-3958

In some situations, when switching between editables, an empty toolbar was shown
instead of hiding it.
This has been fixed now.

Bugfix SUP-3998

Feature detection for selection of multiple ranges in rangy-core caused a deprecation warning in Chrome. Since selection
of multiple ranges is only available in FireFox and is not supported in Aloha-Editor, detecting this feature has been
removed altogether.